Set m_lastRequestedBlockHash correctly - passing an empty vector into Peer::getBlock() leads to a crash.
Set m_lastRequestedBlockHash correctly - passing an empty vector into Peer::getBlock() leads to a crash.

ciphrex/mSIGNA,Faldon/mSIGNA,ciphrex/mSIGNA,ciphrex/mSIGNA,Faldon/mSIGNA